For the geonameid 6617433
the LATIN CAPITAL LIGATURE OE character (utf codepoint 0153) is wrongly encoded as 0x9c instead of 0xc593 in the FR.txt dump.
This is probably because the name has been entered as CP1252 encoded text. (0x9c is the byte code for the LATIN CAPITAL LIGATURE OE in CP1252).